Rotate Page in Google Books

Click on a book page to get arrows in the upper corners for rotating the page in 90 degree increments.

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Rotate Page in Google Books",
  "short_name": "RotateBookPage",
  "description": "Click on a book page to get arrows in the upper corners for rotating the page in 90 degree increments.",
  "version": "0.0.2",
  "minimum_chrome_version": "38",
  "icons": {
    "128": "assets/rotate-page-128.png"
  },
  "permissions": [
    "storage",
    "https://books.google.com/books"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://books.google.com/*"
      ],
      "css": [
        "styles.css"
      ],
      "js": [
        "jquery-3.1.0.min.js",
        "books.js"
      ]
    }
  ]
}